Collapsible core for constructing hollow concrete walls.



W. T. REDMAN. COLLAPSIBLE GORE FOR CONSTRUGTING HOLLOW CONCRETE WALLS.

APPLIGATION FILED DBO. 24, 1910.

2 SHEEITSSHBET 1.

W. T. REDMAN.

- COLLAPSIBLE CORE FOR CONSTRUCTING HOLLOW CONCRETE WALLS.

APPLICATION FILED D3014, 1910. 994,336. Patented June 6, 1911.

Z SHEETS-SHBET 2.

firm/Q7707? /4. fFea mazz the drawings by UNITED STATES PATENT OFFICE.

' WILLIAM '1. REDMAN, OF BRENTWOOD, MARYLAND.

GOLLAPSIBLE CORE FOB CONSTRUCTING HOLLOW CONCRETE WALLS.

Application To all whom it may concern:

Be it known that I, WILLIAM T. RED- MAN, a citizen of the United States, residing at Brentwood, in the county of Prince George and State of Maryland, have invented certain. new and useful Improvements in Collapsible Cores for Constructing Hollow Concrete alls; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had tothe accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

This invention relates to new and usefulimprovements incollapsible cores for use in constructing hollow concrete or composition walls .and the object in view is to produce a simple and eflicient device of this nature which, when the wall is formed, may be reagily taken apart and removed and again use I The invention comprises a simple and eflicient' device of this nature having various details of construction, combinations and arrangements of parts. which will be hereinafter fully described and then. specifically defined in the appendedclaims.

1 illustrate my inve'ntion in the accompanying drawings, in which Figure 1 is aside elevation showing a plurality of collapsible molds adjusted in position for use. Fig. 2 is a vertical sectional view through a section of the wall, showing the manner of supporting the collapsible core member. Fig- 3 is a cross sectional view through one of the core members. Fig. 4 is a bottom plan view with the extensible portion illustrated in Fig. 3-removed. Fig. 5

form of the invention. Fig. 6' is a detail perspective view of the modified form showing the manner of fastening theparts of the .mold together. 7 .Fig. .7 is a detail pers ectiveview of a portion'of; one of the si es of the collapsible core .and showin the holetherein for the reception of the owelpin, and Fig. 8 is an enlarged .detailsectional view through one corner of the modified form of the mold.'

Reference now being had to the details of letter, A, A designate the o positeside walls of the collapsible core illustrated in Figs. 1 1:014 inclusive and in Specification of Letters Patent.

filed December 24, 1910. Serial No. 599,138.

-wedge shaped and is a" sectional view of a slightly modified is also provided with a double iece K is provided s1milarly hinged as.

Patented J unc 6, 1911.

which it will be noted that the ends A of said sides are tapering and rounded as at i 2 and as designated by the shading in Fig. l and as illustrated in Fig. 4 of the drawings.

A top, designated by'letteriB, rests upon the cleats B fastened to'the ends'H of the cores and projecting from each end H is a flange or block C, slotted as at C and which flanges or blocks are of lengths equal to the narrowest space intermediate the inner surfaces of the hollow wall D, as shown clearly in Fig. 2 of the drawings. A. bolt E passes through an aperture in the-extensible block E and also through the slot C and is held in an adjusted position by means of the nut F. By the provision of said extensible block E, the latter may be held in diiIerent-positions according as may be desired at thecorner of a, building where two blocks come to gether at angles to each other or where it may be desired to cause wider keys to be formed between the spacespccupied by the .cores in building up the wall? =Said ends H, as.shown in Fig. 2 of the drawings, are

each has an eye H upon its inner face to which a rope or cord H is fastened, .forming means whereby the sides and ends, when disconnected, may be held from falling. In order to hold the opposite sides securely in place, 'a' turn buckle W is provided, the screws in the ends of whichv I pass through apertures in the opposite walls. In order to prevent the ends H from moving downward, I provide a button X, which is mountedupona pivotal pin X and is adapted to turn into the recesses X shown in dotted lines in Fig. 2 of'thedrawings.

In Fig. -5 of the drawings, I have shown I.

a .slight'modification of my collapsible mold showing'the ends and sides square instead of round and in which the end pieces K are shown 'astapering and each having a flange or block K at its lower end from which rises a dowel pin K shown clearly in Figs. 5 and 6 of the drawings, said flange or block being longitudinally slotted as at is, and also an extensible block K apertured forithe reception of the bolt L passes through said slot k. The upper end of each inclined wall K of the coreh'as a double taper as at N- and one wing O of a hinge is fastened to the top of said end and the other fastened to a top section Q wh1ch taper Q( at its inner end. Each end with a top section Q,

which also shr m in Fig. 5 of the drawings. Fastened lugs.

upon pivotal pins M which project from the sides M of the modified form shown in Figs. 5 and 6 is a locking lever P having its end P widened forming a shoulder P clearly illustrated in Fig. 6 of the drawings, and which widened portion is adapted to engage a recess Q formed in the under edge of the top section Q to securely hold.

the latter from longitudinal movement. The extreme end, designated by letter P of the locking lever P is contracted. and is adapted to engage a slot K formed in the inner inclined face of the end piece K, there by preventing a lateral movement to the side of the core to which the lever is fastoned when the parts are adjusted in place.

By the provision of the double bevel formed at the upper ends of the end pieces K, it will be noted that the end pieces may be reversed if desired with the projecting flanges K extending toward each other and, when in such adjusted positions, the top sections will readily fold toward and overlap each other in the same manner as shown in Fig. 5.

Each side M has a hole M as shown clearly in Fig. 7 of the drawings, in its lower edge which is adapted to engage over the dowel pin in the manner slwwn by dotted lines in Fig.' 6, thereby holding the bottom of the side from lateral movement. When the top sections Q are positioned as shown in Fig. 5, they will be supported by the two locking levers and serve to hold the latter in proper locking relation in the parts they engage.

In operation, the collapsible core is puttogether in the manner shown and any number placed end to end in the manner illustrated in Fig. 1 of the drawings. flanges or blocks K on the extension members held thereto by means of bolts are adjusted to fill the spaces intermediate the lower ends of the cores and the concrete or.

composition filled in about the cores. As the concrete is poured in about the cores,

the spaces intermediate the ends will be filled forming the keys, one of which is shown in section in Fig. 1 of the draw- After the concrete or composition has set, the core may be collapsed by moving the top and applyin pressure to the tops of the end pieces which are tapering upon their opposite edges or. wedge shaped and which will allow the same to be driven downward and allow the side walls to be removed from the faces of the concrete or composition. In the event of the sidewalls being held fast to the face of the concrete or composition, said locking levers P may be swung upon their pivot and fulcrumed upon the edge of the concrete and serveas. means for assisting in loosening the sides from the surface of the The.

concrete. After the ends have been removed, it will be understood that the side walls may be moved, toward each other and the parts of the core which are fastened together by the chain or rope, be withdrawn from the space and set up upon the top of the wall thus commenced to further build up another course. After the first course has been constructed and in adjusting the 1. A collapsible core for building concrete and composition walls,- having its opposite side and end walls inclined and wedgeshaped, a plate fastened at the bottom of each end wall and exte iding beyond the opposite upright edges o t' the latter, the bottoms of the opposite side walls contacting the upper surfaces of said extending portions of said plates'and overhanging the sides t-hereof.

2. A collapsible core for building concrete and composition walls, having its opposite side and end walls inclined .and wedgeshaped, a plate fastened at the bottom 'of each end wall and extending beyond the 0pposite upright edges of the latter, the bottoms of the opposite side wallscontacting the upper surfaces of said extending portions of said plates and overhanging the" toms of the opposite side walls contacting the upper surfaces of said extending portions of said plates and overhanging the sides thereof, an extensible member fastened to said plate, means for holding said member in an adjusted position, dowel pins rising from the projecting portion of said plate and adapted to engage holes in the side walls.

4. A collapsible core for building concrete and composition walls, having its opposite side and end walls inclined and wedgeshaped, a plate fasteiied at the bottom of each end wall and extending beyond the opposite upright edges] of the latter, the bottoms of the opposite side walls contacting the upper surfacesof said extending.

portions of said plates and overhanging the sides thereof, an extensible member fastened.

' formed'in the inner face of the ends oft-he core.

5. A collapsible core for building concrete and com osition walls, having its opposite side an end walls inclined and wedgeshaped, a plate fastened at the bottom of each end wall and extending beyond the opposite upright edges of the latter, the bottoms of the o posite side walls contacting the upper sur aces of said extending portions of said plates and overhanging the sides thereof, an extensible member fastened to said plate, means forholding said member in an adjusted position, dowel pins rising from the project-ing portion of said plate and adapted to engage holes in the side walls, locking levers pivotally mounted upon the side walls and adapted to engage slots formed in the inner face of the ends of the core, a top to the mold having a recess therein and adapted to be engaged by said looking levers.

6. A colla and composition walls, having its opposite side and end walls inclined and Wedge shaped, a plate fastened at the bottom of each psible core for building concrete end walland extending beyond the opposite upight edges of the latter, the bottoms of the opposite side walls contacting the upper surfaces of said extending portions of said plates and overhanging the sides thereof, an extensible member fastened to said plate, means for holding said member in an adjusted posit-ion, dowel pins rising from the projecting portion of said plate and adapt ed to engage holes in the side Walls, locki levers pivotally mounted upon the sides an having one end contracted and adapted to engage a slot in the end of the core, the upper edge of the lever having a shoulder, a top hinged to the end wall and provided with a recess for the reception of said shoulder. I

7. A collapsible core for building concrete and composition walls having its opposite Walls inclined and end walls inclined and Wedge shaped, a projection upon each end wall atits lower end extending beyond the face and edges of the end, means for holding i the side walls upon said extension of the end Wall, the top of each end having a double bevel, a top section having a double bevel end hinged to the top of the end section.

In testimony whereof I hereunto afiix my signature in the presence of two witnesses. WILLIAMT. REDMAN. Witnesses:

A. L. HOUGH, J. ,W. Moran.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

